[logik-7vk61-2-stufiger-svs-phgem-anwurf, 1, en_GB]
Figure 2-42
Logic diagram of the two-stage breaker failure protection
Circuit breaker not operational
There may be cases when it is already obvious that the circuit breaker associated with a feeder protection relay
cannot clear a fault, e.g. when the tripping voltage or the tripping energy is not available.
In such a case it is not necessary to wait for the response of the feeder circuit breaker. If provision has been
made for the detection of such a condition (e.g. control voltage monitor or air pressure monitor), the monitor
alarm signal can be fed to the binary input
>CB faulty
of the 7VK61. On occurrence of this alarm and a trip
command by the feeder protection, a separate timer T3-BkrDefective is started (see Figure 2-43), which is
normally set to 0. Thus, the adjacent circuit breakers (bus-bar) are tripped immediately in case the feeder
circuit breaker is not operational.
Functions
2.6 Circuit breaker failure protection (optional)
SIPROTEC 4, 7VK61, Manual 123
C53000-G1176-C159-5, Edition 05.2018
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